diff options
| author | Alexander Gordeev <agordeev@redhat.com> | 2012-06-07 15:16:25 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-06-08 11:44:30 +0200 |
| commit | 4988a40c3981212fa8c64da68722affc1cb6697a (patch) | |
| tree | 0210395a3b47a0295ca5015e6ad2d16e1bc58a5e /arch/x86/kernel/apic/x2apic_uv_x.c | |
| parent | ff164324123c0fe181d8de7dadcc7b3fbe25f2cf (diff) | |
x86/apic: Make cpu_mask_to_apicid() operations check cpu_online_mask
Currently cpu_mask_to_apicid() should not get a offline CPU with
the cpumask. Otherwise some apic drivers might try to access
non-existent per-cpu variables (i.e. x2apic). In that regard
cpu_mask_to_apicid() and cpu_mask_to_apicid_and() operations are
inconsistent.
This fix makes the two operations do not rely on calling
functions and always return the apicid for only online CPUs. As
result, the meaning and implementations of cpu_mask_to_apicid()
and cpu_mask_to_apicid_and() operations become straight.
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120607131624.GG4759@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/apic/x2apic_uv_x.c')
| -rw-r--r-- | arch/x86/kernel/apic/x2apic_uv_x.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index 2f3030fef31..307aa076bd6 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -286,7 +286,7 @@ uv_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid) * We're using fixed IRQ delivery, can only return one phys APIC ID. * May as well be the first. */ - int cpu = cpumask_first(cpumask); + int cpu = cpumask_first_and(cpumask, cpu_online_mask); return __uv_cpu_to_apicid(cpu, apicid); } |